Plug holder



FIG. 1 is a front view of the plug holder showing my new design;

FIG. 2 is a left-side view of the plug holder;

FIG. 3 is a right-side view of the plug holder;

FIG. 4 is a top view of the plug holder;

FIG. 5 is a bottom view of the plug holder; and,

FIG. 6 is a back view of the plug holder. 

CLAIM I claim the ornamental design for the plug holder, as shown and described. 